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Also, forgot to mention after finishing with the manifold and letting the engine idle up to temp I noticed that the catalytic converter was on the verge of glowing red. It was night time and just barely noticeable. I'm trying to make a link between the glowing cat and the odd O2 sensor...
I finished replacing the exhaust manifold yesterday, also new O2 sensor. Exhaust leaks seem to be gone, there was severe cracking on the old manifold. Probing the new O2 sensor shows no change from what I measured before, 0.35v-0.65v at idle with engine warm. No voltage engine off. No...
Ah I see what you're saying, perhaps the heater circuit provides voltage for the sensor portion. Since I'll likely replace the O2 sensor anyways I feel comfortable with cutting the wire on the sensor side of the connector and testing. Will report back once I get the jeep put back together...
Quoting from the sticky thread about testing the O2 sensor. It is my understanding that post-90 O2 sensors were the voltage generating type and pre-90 was the titania style that is simply a variable resistor. From what I'm measuring with my DMM, .45v to .95v I want to assume it is the newer...
First post, but I've spent many hours on this site. Thank you!
Background: I just purchased an 87 cherokee 4dr, 5spd manual, and 2.5l engine. It sat in the previous owners yard for several years, he claimed it just had a coolant leak. In my quest to get it registered/smogged (in...